The Belgium midfielder will be sent for his second scan on a wrist injury that has kept him out since the beginning of the month, with surgery still a possibility at this stage
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Fellaini will now be sent for a second scan to assess the extent of the injury and, if it is likely to keep him sidelined for an extended period, United will also take the opportunity to schedule an overdue wrist operation.
"Fellaini has an injury to his back, which we hoped might have healed up but it hasn't," Moyes told reporters.
"I am going to get another scan and if it hasn't healed up then I might need to take the decision to get his wrist done as well.
"We hoped his back would be better in 10 days but he is still feeling it."
Fellaini moved to Old Trafford following a protracted transfer saga in the summer, with Goal revealing that the deal could cost Manchester United up to £82.3 million if he sees out the length of his contract.
He has struggled to make an impact since completing the transfer, however, and United are languishing in mid-table ahead of Saturday's visit of West Ham.